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          <!---->
          2020
        </a></span></div></div> <div data-v-3ba18f14><main class="page"><div class="page-title" style="display:none;"><h1 class="title"></h1> <div data-v-5d8dbdb4><i class="iconfont reco-account" data-v-5d8dbdb4><span data-v-5d8dbdb4>海星</span></i> <!----> <!----> <!----></div></div> <div class="theme-reco-content content__default" style="display:none;"><blockquote><p>上篇大都是概念性东西，作为一名优秀的 Javaer，肯定要实战一番。加油，奥利给！</p> <p>文章收集在 GitHub <a href="https://github.com/Jstarfish/JavaEgg" target="_blank" rel="noopener noreferrer">JavaEgg<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a> 中，欢迎 star+指导，N线互联网开发必备兵器库</p></blockquote> <p>分布式安装部署，作为一个后端开发正规军，公司一般也不需要你去自己安装，就不探讨了。</p> <h2 id="客户端命令行操作"><a href="#客户端命令行操作" class="header-anchor">#</a> 客户端命令行操作</h2> <p>安装好了之后，先在服务器上了解下命令</p> <h3 id="操作-zookeeper"><a href="#操作-zookeeper" class="header-anchor">#</a> 操作 Zookeeper</h3> <ol><li>启动 Zookeeper:  <code>bin/zkServer.sh start</code></li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>/usr/local/bin/java
ZooKeeper JMX enabled by default
Using config: /home/sync360/test/apache-zookeeper-3.5.7-bin/bin/<span class="token punctuation">..</span>/conf/zoo.cfg
Starting zookeeper <span class="token punctuation">..</span>. STARTED
</code></pre></div><ol start="2"><li>查看进程是否启动: <code>jps</code></li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code><span class="token number">4020</span> Jps
<span class="token number">4001</span> QuorumPeerMain
</code></pre></div><ol start="3"><li>查看状态：<code>bin/zkServer.sh status</code></li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>/usr/local/bin/java
ZooKeeper JMX enabled by default
Using config: /home/apache-zookeeper-3.5.7-bin/bin/<span class="token punctuation">..</span>/conf/zoo.cfg
Client port found: <span class="token number">2181</span>. Client address: localhost.
Mode: standalone
</code></pre></div><ol start="4"><li>启动客户端：<code>bin/zkCli.sh</code></li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>Connecting to localhost:2181
<span class="token number">2020</span>-03-25 <span class="token number">15</span>:41:19,112 <span class="token punctuation">[</span>myid:<span class="token punctuation">]</span> - INFO  <span class="token punctuation">[</span>main:Environment@109<span class="token punctuation">]</span> - Client environment:zookeeper.version<span class="token operator">=</span><span class="token number">3.5</span>.7-f0fdd52973d373ffd9c86b81d99842dc2c7f660e, built on 02/10/2020 <span class="token number">11</span>:30 GMT

<span class="token punctuation">..</span>.

<span class="token number">2020</span>-03-25 <span class="token number">15</span>:41:19,183 <span class="token punctuation">[</span>myid:<span class="token punctuation">]</span> - INFO  <span class="token punctuation">[</span>main:ClientCnxn@1653<span class="token punctuation">]</span> - zookeeper.request.timeout value is <span class="token number">0</span>. feature <span class="token assign-left variable">enabled</span><span class="token operator">=</span>
Welcome to ZooKeeper<span class="token operator">!</span>

<span class="token punctuation">..</span>.

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
</code></pre></div><ol start="5"><li><p>退出客户端：<code>quit</code></p></li> <li><p>停止 Zookeeper:  <code>bin/zkServer.sh stop</code></p></li></ol> <h3 id="常用命令"><a href="#常用命令" class="header-anchor">#</a> 常用命令</h3> <table><thead><tr><th>命令基本语法</th> <th>功能描述</th></tr></thead> <tbody><tr><td>help</td> <td>显示所有操作命令</td></tr> <tr><td>ls path [watch]</td> <td>使用 ls 命令来查看当前znode中所包含的内容</td></tr> <tr><td>ls2 path [watch]</td> <td>查看当前节点数据并能看到更新次数等数据</td></tr> <tr><td>create</td> <td>普通创建-s  含有序列-e  临时（重启或者超时消失）</td></tr> <tr><td>get path [watch]</td> <td>获得节点的值</td></tr> <tr><td>set</td> <td>设置节点的具体值</td></tr> <tr><td>stat</td> <td>查看节点状态</td></tr> <tr><td>delete</td> <td>删除节点</td></tr> <tr><td>rmr</td> <td>递归删除节点</td></tr></tbody></table> <h4 id="ls-查看当前-zk-中所包含的内容"><a href="#ls-查看当前-zk-中所包含的内容" class="header-anchor">#</a> ls 查看当前 zk 中所包含的内容</h4> <div class="language-shell extra-class"><pre class="language-shell"><code><span class="token punctuation">[</span>zk: localhost:2181<span class="token punctuation">(</span>CONNECTED<span class="token punctuation">)</span> <span class="token number">1</span><span class="token punctuation">]</span> <span class="token function">ls</span> /
<span class="token punctuation">[</span>lazyegg, zookeeper<span class="token punctuation">]</span>
</code></pre></div><h4 id="create-创建一个新的-znode"><a href="#create-创建一个新的-znode" class="header-anchor">#</a> create 创建一个新的 znode</h4> <div class="language-shell extra-class"><pre class="language-shell"><code><span class="token punctuation">[</span>zk: localhost:2181<span class="token punctuation">(</span>CONNECTED<span class="token punctuation">)</span> <span class="token number">2</span><span class="token punctuation">]</span> create /test
Created /test
</code></pre></div><h4 id="get-查看新的-znode-的值"><a href="#get-查看新的-znode-的值" class="header-anchor">#</a> get 查看新的 znode 的值</h4> <div class="language-shell extra-class"><pre class="language-shell"><code><span class="token punctuation">[</span>zk: localhost:2181<span class="token punctuation">(</span>CONNECTED<span class="token punctuation">)</span> <span class="token number">4</span><span class="token punctuation">]</span> get /test
null
</code></pre></div><p>可以看到值为 null,我们刚才设置了一个没有值得节点，也可以通过 <code>create /zoo dog</code> 直接创建有内容的节点</p> <h4 id="set-对-zk-所关联的字符串进行设置"><a href="#set-对-zk-所关联的字符串进行设置" class="header-anchor">#</a> set 对 zk 所关联的字符串进行设置</h4> <div class="language-shell extra-class"><pre class="language-shell"><code><span class="token builtin class-name">set</span> /test hello
</code></pre></div><h4 id="delete-删除节点"><a href="#delete-删除节点" class="header-anchor">#</a> delete 删除节点</h4> <div class="language-shell extra-class"><pre class="language-shell"><code>delete /test
</code></pre></div><h2 id="api应用"><a href="#api应用" class="header-anchor">#</a> API应用</h2> <p>不管 Java 是不是最好的语言，我都要说 <code>I use Java. Java for ever</code>。所以我们要用 Java 去操作 zookeeper。</p> <p>zookeeper的 Java 常用客户端有 3 种，分别是：zookeeper原生API、开源的 zkclient、Apache Curator</p> <h4 id="_1-原生api"><a href="#_1-原生api" class="header-anchor">#</a> 1. 原生API</h4> <ul><li>创建连接的时候是异步的，所以我们在开发的时候需要人工的写代码等待创建节点的状态，如果需要的话。</li> <li>连接时无超时重连机制。本人觉得这个非常重要，因为在现实使用中，网络是不可信的，在创建节点的时候要考虑到网络的不稳定性。因此，超时重连机制是非常必要的。</li> <li>zookeepr 的通信是网络通信，因此在数据通信的时候会消耗一定的网络IO和带宽。但zookeeper没有序列化机制，需要开发者自行开发。</li> <li>Watcher注册一次，触发后会自动失效。</li> <li>不支持递归创建树形节点。这点是比较有用的，类似Linux的命令：<code>mkdir -p /xxx/xxx/</code></li></ul> <h4 id="_2-zkclient"><a href="#_2-zkclient" class="header-anchor">#</a> 2. ZkClient</h4> <p>ZkClient 是 Github上一个开源的 zk 客户端，由 datameer 的工程师 Stefan Groschupf 和 Peter Voss 一起开发</p> <ul><li>解决session会话超时重连</li> <li>Watcher反复注册</li> <li>简化开发api</li></ul> <p>当然还有很多的很多修改的功能，使用也很简单，但是社区不活跃，连api文档都不完善，对于我们来说只能看源码来开发应用了，也略有麻烦的。有兴趣的开源上 github 看看。 https://github.com/sgroschupf/zkclient</p> <h4 id="_3-curator"><a href="#_3-curator" class="header-anchor">#</a> 3. Curator</h4> <p>Curator 是 Netflix 公司开源的一套 Zookeeper Java 客户端框架。后来成为 Apache 基金会的顶级项目之一 。</p> <p>http://curator.apache.org/</p> <p>目前使用最多的也是 Curator，公司用的也是这个，所以用这个学习记录（基于 2019-07-14 发布的官方版本）</p> <p><img src="http://curator.apache.org/images/ph-quote.png" alt="img"></p> <h3 id="maven依赖"><a href="#maven依赖" class="header-anchor">#</a> Maven依赖</h3> <p>Curator 由多个 artifact 组成。根据需要选择引入具体的 artifact，但大多数情况下只用引入<code>curator-recipes</code>即可。</p> <table><thead><tr><th style="text-align:left;"><strong>GroupID/Org</strong></th> <th style="text-align:left;"><strong>ArtifactID/Name</strong></th> <th style="text-align:left;"><strong>Description</strong></th></tr></thead> <tbody><tr><td style="text-align:left;">org.apache.curator</td> <td style="text-align:left;">curator-recipes</td> <td style="text-align:left;">所有典型应用场景。需要依赖client和framework，需设置自动获取依赖</td></tr> <tr><td style="text-align:left;">org.apache.curator</td> <td style="text-align:left;">curator-async</td> <td style="text-align:left;">具有O/R建模、迁移和许多其他特性的异步DSL</td></tr> <tr><td style="text-align:left;">org.apache.curator</td> <td style="text-align:left;">curator-framework</td> <td style="text-align:left;">高级 API,建立在客户端之上的，应该会自动将其拉入</td></tr> <tr><td style="text-align:left;">org.apache.curator</td> <td style="text-align:left;">curator-client</td> <td style="text-align:left;">Zookeeper client的封装，用于取代原生的Zookeeper客户端</td></tr> <tr><td style="text-align:left;">org.apache.curator</td> <td style="text-align:left;">curator-test</td> <td style="text-align:left;">包含TestingServer、TestingCluster和一些用于测试的其他工具</td></tr> <tr><td style="text-align:left;">org.apache.curator</td> <td style="text-align:left;">curator-examples</td> <td style="text-align:left;">示例</td></tr> <tr><td style="text-align:left;">org.apache.curator</td> <td style="text-align:left;">curator-x-discovery</td> <td style="text-align:left;">在framework上构建的服务发现实现</td></tr> <tr><td style="text-align:left;">org.apache.curator</td> <td style="text-align:left;">curator-x-discovery-server</td> <td style="text-align:left;">可以使用Curator Discovery的RESTful服务</td></tr></tbody></table> <h3 id="版本兼容"><a href="#版本兼容" class="header-anchor">#</a> 版本兼容</h3> <p>http://curator.apache.org/zk-compatibility.html</p> <p>为了可以直观的看到 Zookeeper 的节点信息，可以考虑弄一个 zk 的管控界面，常见的有 zkui 和 zkweb。</p> <p>zkui：<a href="https://github.com/DeemOpen/zkui" target="_blank" rel="noopener noreferrer">github.com/DeemOpen/zk…<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></p> <p>zkweb：<a href="https://github.com/zhitom/zkweb" target="_blank" rel="noopener noreferrer">github.com/zhitom/zkwe…<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></p> <p>我用的 zkweb ，虽然界面上看起来没有 zkui 精简，但是在层次展示和一些细节上感觉比 zkui 好一点</p> <h3 id="开干"><a href="#开干" class="header-anchor">#</a> 开干</h3> <div class="language-xml extra-class"><pre class="language-xml"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">&gt;</span></span>org.apache.curator<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">&gt;</span></span>curator-recipes<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>version</span><span class="token punctuation">&gt;</span></span>4.3.0<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>version</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p>建议直接 clone https://github.com/apache/curator ，<code>curator-examples</code> 下边有各种示例，选举、分布式锁、服务发现、缓存。。。</p> <p>Curator使用流式接口风格。</p> <h4 id="_1-coding"><a href="#_1-coding" class="header-anchor">#</a> 1. coding</h4> <div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">CuratorTest</span> <span class="token punctuation">{</span>

    <span class="token keyword">public</span> <span class="token class-name">String</span> zookeeperConnectionString <span class="token operator">=</span> <span class="token string">&quot;10.121.214.95:2181&quot;</span><span class="token punctuation">;</span>
    <span class="token class-name">CuratorFramework</span> client<span class="token punctuation">;</span>

    <span class="token comment">/**
     *  创建客户端，两种方式，默认客户端，带参数的客户端创建
     */</span>
    <span class="token annotation punctuation">@Before</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token class-name">CreateClient</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">RetryPolicy</span> retryPolicy <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ExponentialBackoffRetry</span><span class="token punctuation">(</span><span class="token number">1000</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        client <span class="token operator">=</span> <span class="token class-name">CuratorFrameworkFactory</span><span class="token punctuation">.</span><span class="token function">newClient</span><span class="token punctuation">(</span>zookeeperConnectionString<span class="token punctuation">,</span> retryPolicy<span class="token punctuation">)</span><span class="token punctuation">;</span>
        client<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token comment">/**
     * 有了CuratorFramework 实例，就可以使用了,先来创建个空节点
     */</span>
    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">createPath</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            client<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forPath</span><span class="token punctuation">(</span><span class="token string">&quot;/myPath1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            client<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forPath</span><span class="token punctuation">(</span><span class="token string">&quot;/myPath1/myChildren1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            client<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forPath</span><span class="token punctuation">(</span><span class="token string">&quot;/myPath1/myChildren2&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//client.create().forPath(&quot;/myPath1&quot;,&quot;myData1&quot;.getBytes());</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>


    <span class="token comment">/**
     * 创建临时节点
     * 和持久节点不同的是，临时节点的生命周期和客户端会话绑定。
     * 也就是说，如果客户端会话失效，那么这个节点就会自动被清除掉。
     * 注意，这里提到的是会话失效，而非连接断开。另外，在临时节点下面不能创建子节点。
     */</span>
    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">createEphemeral</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
        client<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">withMode</span><span class="token punctuation">(</span><span class="token class-name">CreateMode</span><span class="token punctuation">.</span>EPHEMERAL<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forPath</span><span class="token punctuation">(</span><span class="token string">&quot;/myPath2&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;myData2&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token comment">/**
     *  为节点设置数据
     */</span>
    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setData</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
        client<span class="token punctuation">.</span><span class="token function">setData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forPath</span><span class="token punctuation">(</span><span class="token string">&quot;/myPath1&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;myData1&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token comment">/**
     *  列出子节点
     */</span>
    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">watchedGetChildren</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> client<span class="token punctuation">.</span><span class="token function">getChildren</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">watched</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forPath</span><span class="token punctuation">(</span><span class="token string">&quot;/myPath1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">String</span> s <span class="token operator">:</span> list<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>s<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>


    <span class="token comment">/**
     *  删除节点
     *  sguaranteed()：接口是一个保障措施，只要客户端会话有效，
     *  那么Curator会在后台持续进行删除操作，直到节点删除成功
     *  deletingChildrenIfNeeded()： 删除一个节点，并递归删除其所有子节点
     */</span>
    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">guaranteedDelete</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
        <span class="token comment">//client.delete().forPath(&quot;/myPath1&quot;);</span>
        <span class="token comment">//client.delete().guaranteed().forPath(&quot;/myPath1&quot;);</span>
        client<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">deletingChildrenIfNeeded</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forPath</span><span class="token punctuation">(</span><span class="token string">&quot;/myPath1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="curator-async"><a href="#curator-async" class="header-anchor">#</a> Curator Async</h2> <h3 id="what-is-curator-async"><a href="#what-is-curator-async" class="header-anchor">#</a> What Is Curator Async?</h3> <p>Curator Async 是一个封装了 <code>CuratorFramework</code>  实例的 <code>DSL(Domain-specific language)</code></p> <p>完全异步，基于 Java8 的<code>CompletionStage</code></p> <p>https://curator.apache.org/curator-x-async/index.html</p> <p>https://blog.gmem.cc/apache-curator-study-note</p> <p>pc广告在上海 zk用作配置管理，有可投放的商品包状态变动会通知他们</p> <h2 id="参考"><a href="#参考" class="header-anchor">#</a> 参考</h2> <p>《Zookeeper客户端对比选择》 https://www.cnblogs.com/liangjf/p/8552559.html</p> <p>https://juejin.im/post/5cb1ec81e51d456e3b701871</p> <h2 id="直击面试"><a href="#直击面试" class="header-anchor">#</a> 直击面试</h2> <ul><li><p>请简述ZooKeeper的选举机制</p></li> <li><p>ZooKeeper的监听原理是什么？</p></li> <li><p>ZooKeeper的部署方式有哪几种？集群中的角色有哪些？集群最少需要几台机器？</p> <p>部署方式单机模式、集群模式</p> <p>角色：Leader和Follower</p> <p>集群最少需要机器数：3</p></li> <li><p>ZooKeeper的常用命令</p> <p>ls create get delete set…</p></li></ul> <p><img src="/assets/img/blog_end.882cbb13.png" alt=""></p></div> <footer class="page-edit" style="display:none;"><!----> <!----></footer> <!----> <!----> <!----></main> <!----></div></div></div></div><div class="global-ui"><div class="back-to-ceiling" style="right:1rem;bottom:6rem;width:2.5rem;height:2.5rem;border-radius:.25rem;line-height:2.5rem;display:none;" data-v-db14854a data-v-db14854a><svg t="1574745035067" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5404" class="icon" data-v-db14854a><path d="M526.60727968 10.90185116a27.675 27.675 0 0 0-29.21455937 0c-131.36607665 82.28402758-218.69155461 228.01873535-218.69155402 394.07834331a462.20625001 462.20625001 0 0 0 5.36959153 69.94390903c1.00431239 6.55289093-0.34802892 13.13561351-3.76865779 18.80351572-32.63518765 54.11355614-51.75690182 118.55860487-51.7569018 187.94566865a371.06718723 371.06718723 0 0 0 11.50484808 91.98906777c6.53300375 25.50556257 41.68394495 28.14064038 52.69160883 4.22606766 17.37162448-37.73630017 42.14135425-72.50938081 72.80769204-103.21549295 2.18761121 3.04276886 4.15646224 6.24463696 6.40373557 9.22774369a1871.4375 1871.4375 0 0 0 140.04691725 5.34970492 1866.36093723 1866.36093723 0 0 0 140.04691723-5.34970492c2.24727335-2.98310674 4.21612437-6.18497483 6.3937923-9.2178004 30.66633723 30.70611158 55.4360664 65.4791928 72.80769147 103.21549355 11.00766384 23.91457269 46.15860503 21.27949489 52.69160879-4.22606768a371.15156223 371.15156223 0 0 0 11.514792-91.99901164c0-69.36717486-19.13165746-133.82216804-51.75690182-187.92578088-3.42062944-5.66790279-4.76302748-12.26056868-3.76865837-18.80351632a462.20625001 462.20625001 0 0 0 5.36959269-69.943909c-0.00994388-166.08943902-87.32547796-311.81420293-218.6915546-394.09823051zM605.93803103 357.87693858a93.93749974 93.93749974 0 1 1-187.89594924 6.1e-7 93.93749974 93.93749974 0 0 1 187.89594924-6.1e-7z" p-id="5405" data-v-db14854a></path><path d="M429.50777625 765.63860547C429.50777625 803.39355007 466.44236686 1000.39046097 512.00932183 1000.39046097c45.56695499 0 82.4922232-197.00623328 82.5015456-234.7518555 0-37.75494459-36.9345906-68.35043303-82.4922232-68.34111062-45.57627738-0.00932239-82.52019037 30.59548842-82.51086798 68.34111062z" p-id="5406" data-v-db14854a></path></svg></div><!----></div></div>
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